Health check curl example

[Markus Valentin]

The -e parameter is used to define a "list of environment variables", so the error message telling you that you did not define a script is right. 

So far i understood that you wanted to use passthrough mode, so do not use -e but -p. (except you need to define some environment-variables for your script).

Executing the script executable standalone does not work it must be started from the dovecot master process, that is why you are getting the Panic. 

Markus

> On November 25, 2019 10:06 AM Marc Roos <m.roos at f1-outsourcing.eu> wrote:
> 
>  
> Thanks, Markus, maybe we should add this to the admin_manual? However I 
> am now getting the error 'script: Fatal: Missing script path'
> 
> Similar as when I try via the command line
> bash-5.0# /usr/libexec/dovecot/script -e  /bin/health-check.sh
> Fatal: Missing script path
> 
> 
> bash-5.0# /usr/libexec/dovecot/script -e  /bin/ health-check.sh
> Panic: BUG: No IOs or timeouts set. Not waiting for infinity.
> Aborted (core dumped)
> 
> 
> 
> 
> -----Original Message-----
> Subject: Re: Health check curl example
> 
> Hi,
> 
> you can use telnet or netcat to send input to that port and receive the 
> answer.
> 
> echo "PING" | nc localhost 5001
> 
> Best regards
> 
> Markus
> 
> 
> On 11/24/19 2:43 PM, Marc Roos via dovecot wrote:
> >  
> > How do I check the standard script then on this port 5001 from the 
> > command line?
> > 
> > 
> > This one of alpine linux also does not have it yet bash-5.0# dovecot 
> > --version
> > 2.3.7.2 (3c910f64b)
> > 
> > 
> > 
> > 
> > 
> > -----Original Message-----
> > Subject: RE: Health check curl example
> > 
> > Yes. The passthrough option is rather new. 
> > 
> > Aki
> > 
> > 	On 24/11/2019 15:28 Marc Roos via dovecot < dovecot at dovecot.org>
> > wrote: 
> > 
> > 
> > 	I think I already have that, I am having this configured
> > 
> > 	service health-check { 
> > 	# this is the default configuration using the simple PING->PONG 
> > 	# example health-check. 
> > 	executable = script -p /bin/health-check.sh 
> > 	inet_listener health-check { 
> > 	port = 5001 
> > 	} 
> > 	}
> > 
> > 	bash-5.0# /bin/health-check.sh 
> > 	HTTP/1.1 200 OK 
> > 	Connection: keep-alive
> > 
> > 	OK
> > 
> > 
> > 
> > 
> > 
> > 	-----Original Message----- 
> > 	Subject: Re: Health check curl example
> > 
> > 	Your health check script should implement HTTP protocol. Then you 
> can
> > 	use passthrough mode and use cURL. 
> > 
> > 	The provided script does not speak HTTP. 
> > 
> > 	Aki
> > 
> > 	On 24/11/2019 15:12 Marc Roos via dovecot < dovecot at dovecot.org> 
> > 	wrote: 
> > 
> > 
> > 	I am not understanding how this health check[1] script should 
> work. 
> > 
> > 	From 
> > 	the commandline it works fine when I type a PING I get a PONG. 
> But 
> > 	how 
> > 	do I do a curl to this 5001 port? 
> > 
> > 	Tried something like this: 
> > 
> > 	bash-5.0# curl http://localhost:5001/ 
> > 	curl: (56) Recv failure: Connection reset by peer
> > 
> > 	bash-5.0# curl http://localhost:5001/PING 
> > 	curl: (56) Recv failure: Connection reset by peer
> > 
> > 	[1] 
> > 	https://doc.dovecot.org/admin_manual/health_check/
> > 
> > 
> > 	--- 
> > 	Aki Tuomi
> > 
> > 
> > ---
> > Aki Tuomi
> > 
> >